Physics · 2019
JEE Main · 12 April 2019, Shift 2 · Q13
A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound? [Given reference intensity of…
A small speaker delivers $\displaystyle 2$ W of audio output. At what distance from the speaker will one detect $\displaystyle 120$ dB intensity sound ? [Given reference intensity of sound as $\displaystyle 10^{-12} \mathrm{~W} / \mathrm{m}^2$ ]
Official answer
(4)
$\displaystyle 40$ cm
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.